<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./node_modules/jquery/dist/jquery.js"></script>
    <style>
        div{
            width: 100px;
            height: 100px;
            background:red;
            display: none;
        }
    </style>
</head>
<body>
    <button>显示</button>
    <div></div>
    <script>

        // console.log($);
        $('button').click(()=>{
            // $('div').show();

            $('div').toggle()
        })

    </script>
</body>
</html>